The RMT with quality construction is one great bike to ride! The hardtail frame is molded from durable, no-rust aluminum, lighter than steel. That makes this bike easier to accelerate, easier to maintain momentum, and easier to handle. This bike is delivered with all tools included for fast assembly. Larger wheels maintain rolling momentum; all-terrain tread pattern provides less rolling resistance than typical mountain bike tires. This mountain trail bike performs equally well for gravel paths and for paved streets Machined alloy wheel rims enable superior brake pad contact to enable the alloy linear pull brakes to consistently stop on demand; Krayton grips and pedals feel good and comfortable Just twist to shift; the complete SHIMANO drivetrain- 21-speed SHIMANO Revoshift and SHIMANO Tourney indexed derailleur - delivers seamless gear shifting as you adjust for your terrain. Limited 10-year frame warranty (see owner's manual for more details) Free domestic shipping within Contiguous U.S. Added surcharge outside Contiguous U.S. i.e. Alaska, Hawaii, Puerto Rico, and Virgin Islands. Sizing: 15-inch frame is suggested for a minimum inseam of 28 inches 17-inch frame is suggested for a minimum inseam of 31 inches